Software Operation; Intracalling During Esa Mode; Esa Call Processing - Nortel DMS-100 Series Maintenance Manual

3-12 ESA maintenance overview

Software operation

For a summary of the software operation of the ESA feature package and a
list of the specified features, refer to Extended Peripheral Module
Translations Reference Manual, 297-8321-815.

Intracalling during ESA mode

Intracalling provides the capability of switching calls at the remote location
during ESA mode.
The number of designated intracalling channels on the RLCM determines
the number of intra- and interswitched calls that the system supports during
ESA. The number of channels depends on the number of equipped DS-1
ports available and the number of DS-1 links the system uses for host
communication.
During ESA mode, the system handles intracalling through the ESA
processor. The ESA processor contains part of the translation data in the
DMS CC.

ESA call processing

When the RLCM is in ESA mode, the ESA CC handles line-to-line call
processing. Refer to the figure ESA CC Basic Call Processing Structure.
The ESA CC has one queue. The system sends the messages from the
server to this first-in first-out queue for call processing. Before call
processing begins, terminal data are required. Terminal data are gathered
from the static data downloaded from the DMS CC and the dynamic data
from the terminal status table (TST).
Refer to the figure "ESA CC basic call processing structure" for a diagram
of the queues.
297–8351–550 Standard 04.01 August 1999